Icon for a display screen



FIG. 1 is a top, front, right side perspective view of an icon for a display screen, on an enlarged scale;

FIG. 2 is a front view thereof, on an enlarged scale;

FIG. 3 is a front view thereof, on a greatly enlarged scale, the icon is shown separately for clarity of illustration; and,

FIG. 4 is a front view thereof, the icon is shown separately for clarity of illustration.

The broken line drawing of a display screen in FIGS. 1 and 2 is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for an icon for a display screen, as shown and described. 